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如您所知，当我们尝试将 Scrapy Splash 与 Crawlera 一起使用时，我们会使用此 lua 脚本：

function use_crawlera(splash)
    -- Make sure you pass your Crawlera API key in the 'crawlera_user' arg.
    -- Have a look at the file spiders/quotes-js.py to see how to do it.
    -- Find your Crawlera credentials in https://app.scrapinghub.com/
    local user = splash.args.crawlera_user

    local host = 'proxy.crawlera.com'
    local port = 8010
    local session_header = 'X-Crawlera-Session'
    local session_id = 'create'

    splash:on_request(function (request)
        request:set_header('X-Crawlera-Cookies', 'disable')
        request:set_header(session_header, session_id)
        request:set_proxy{host, port, username=user, password=''}
    end)

    splash:on_response_headers(function (response)
        if type(response.headers[session_header]) ~= nil then
            session_id = response.headers[session_header]
        end
    end)
end

function main(splash)
    use_crawlera(splash)
        splash:init_cookies(splash.args.cookies)
        assert(splash:go{
            splash.args.url,
            headers=splash.args.headers,
            http_method=splash.args.http_method,
        })    
            assert(splash:wait(3))
        return {
            html = splash:html(),
            cookies = splash:get_cookies(),
        }
end

该lua脚本中有一个session_id我非常需要的变量，但是我如何从Scrapy的响应中访问它？

我已经尝试过response.session_id，或者response.headers['X-Crawlera-Session']两者都不起作用。

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2 回答 2

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使用splash:set_result_header。

于 2019-07-05T13:41:12.963 回答
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  1. 在你的 lua 脚本中返回 HAR 数据（https://splash.readthedocs.io/en/stable/scripting-ref.html#splash-har ）：
    return {
        html = splash:html(),
        har = splash:har(),
        cookies = splash:get_cookies(),
    }
  1. 假设您使用的是 scrapy-splash ( https://github.com/scrapy-plugins/scrapy-splash )，请确保将execute端点设置为您的请求：

meta['splash']['endpoint'] = 'execute'.

如果使用scrapy.Request，render.json 是默认端点，但scrapy_splash.SplashRequest默认端点是 render.html。查看这 2 个示例以了解如何设置端点：https ://github.com/scrapy-plugins/scrapy-splash#requests

  1. 只有现在您可以在 parse 方法中访问X-Crawlera-Session标题：
    def parse(self, response):
        headers = json.loads(response.text)['har']['log']['entries'][0]['response']['headers']
        session_id = next(x for x in headers if x['name'] == 'X-Crawlera-Session')['value']

>>> headers = json.loads(response.text)['har']['log']['entries'][0]['response']['headers']
>>> next(x for x in headers if x['name'] == 'X-Crawlera-Session')
{u'name': u'X-Crawlera-Session', u'value': u'2124641382'}
于 2019-07-06T16:59:29.600 回答